Two funds can look different and still move as one. Check any pair in seconds: overlap by portfolio weight, every shared holding, no sign-up.
Why it matters: VOO + VTI are ~88% the same portfolio. High overlap means doubled exposure to the same names, not extra safety.
Search by ticker or fund name across the most popular US funds.
Every position is matched by security identifier (CUSIP), so the same stock is recognized across funds and share classes stay distinct.
For each shared stock we take the smaller weight, then sum. 100% = identical portfolios; 0% = nothing in common.